JPS6343515B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a needle felt for paper making having a smooth surface and a method for manufacturing the same. As shown schematically in FIG. 1, a needle felt for paper making, in which a fiber web is polymerized and needled on the front or front and back surfaces of a base fabric 1 to form a felt layer 2 on at least the front side, is compared to a woven canvas. It has recently been widely used for high-quality paper because it has excellent smoothness, cushioning properties, and flexibly presses wet paper against the dry roll surface. However, the above-mentioned smoothness is influenced by the type of fibers constituting the felt layer, particularly the diameter (fineness) of the fibers, and the smaller the fineness, the better the smoothness. However, in papermaking, synthetic fibers of 7 to 12 deniers, which are slightly thicker than animal and plant fibers, are generally used because good air permeability is required. On the other hand, when needling is performed using a web made of fibers with such fineness, there is a problem that not only the felt layer 2 is not tight enough and good smoothness cannot be obtained, but also that the fibers fall off during use. There is a point. In particular, the shedding of these fibers develops from fuzzing on the surface of the felt layer, and in order to eliminate this fuzzing, a fluffing treatment is actually performed. However, when the fluffing process is applied, since the fibers constituting the felt layer 2 are synthetic fibers, molten beads 3, 3 remain on the surface of the felt layer as shown in the enlarged diagram in Figure 2, and pinholes are formed in the paper. Depending on the type of fiber, brown to black burnt marks may remain, which is a problem in paper making. The present invention relates to a needle felt for paper making, which prevents hair removal from the surface of the felt layer without relying on the above-mentioned burning process, and improves surface smoothness, and a method for producing the same. As shown in FIG. 3, a hardened layer 4 is formed by coating or impregnating a synthetic resin on the surface of the felt layer 2, and the surface of the hardened layer 4 is polished. In addition, in the manufacturing method, after polymerizing the web on the front or front and back surfaces of the base fabric 1, needling is performed to form a felt layer 2 on at least the paper making side of the base fabric 1, and then the felt layer 2 is formed on the surface of the felt layer 2. After applying or impregnating a synthetic resin liquid, drying and curing the synthetic resin liquid,
This method is characterized in that the surface of the felt layer 2 is then polished. More specifically, a synthetic fiber web having a fineness of 7 to 12 deniers is appropriately polymerized on a base fabric 1, and then needling is performed to form a felt layer 2 on at least the paper-making side of the base fabric 1, and then a pressure roller A synthetic resin liquid is coated or impregnated on the felt layer 2 of a conventional papermaking needle felt 5, which is obtained by compressing the felt layer 2 and smoothing its surface by a method (not shown), followed by drying and curing. The felt layer 2 as shown schematically in FIG.
A hardened layer 4 is formed on the surface of the papermaking side of the hardened layer 4, and then the surface of the hardened layer 4 is polished with fine sandpaper to remove the fluffy fibers 6 on the surface of the hardened layer 4, that is, the papermaking side surface of the felt layer 2. This papermaking needle felt has a smooth surface with no surface fibers falling off. The thus obtained needle felt for paper making is
Compared to conventional needle felts of this type, the surface smoothness on the paper-making side is clearly improved, and there is almost no fuzz that would cause concerns about shedding when used for paper-making, making it ideal for making high-quality paper. It has a suitable surface. Further, the coating or impregnating treatment with the synthetic resin liquid and the drying-hardening-polishing treatment do not cause damage to the felt layer 2 as well as the base fabric 1, and there is almost no deterioration in strength, air permeability, etc. Example The base fabric 1 is a double-woven fabric woven using a 2000 denier polyester multifilament yarn for the warp 10 and a 4000 denier polyester multifilament yarn for the weft 11.
A needle felt made by layering webs made of 30% denier polyamide short fibers, 30% 7 denier acrylic short fibers, and 40% 10 denier polyester short fibers, applying needling, and then passing between pressure rollers. An acrylic acid ester resin liquid was applied to the surface of the paper making side using a well-known roll method. (Coating amount: about 30 g/m ² ) Next, the needle felt was dried at 110° C. and cured at 160° C. for 3 minutes to form a cured layer 4 on the surface side of the felt layer 2 of the needle felt. Afterwards
The surface of the cured layer 4 was polished using 800# sandpaper. As a result of the above-mentioned polishing treatment, the surface of the obtained needle felt has short residual fluff, as shown in an enlarged schematic diagram in FIG. The aforementioned problems with baked needle felts are eliminated. Moreover, as shown in the following table, almost no change in physical properties was observed between before and after resin coating, drying, curing, and polishing. 【table】

[Brief explanation of drawings]

Fig. 1 is a partially enlarged sectional view of a conventional needle felt, Fig. 2 is a super enlarged view of the fluffed surface, Fig. 3 is a partially enlarged sectional view of the needle felt of the present invention, and Fig. 4 is a polished treatment. The previous enlarged sectional view and FIG. 5 are super enlarged views of the surface of the needle felt of the present invention. 1... Base fabric, 2... Felt layer, 4... Hardened layer, 5... Needle felt, 6... Fluff.

Claims (1)

[Scope of Claims] 1. A hardened layer 4 formed by coating or impregnating a synthetic resin on the surface of the papermaking side of the felt layer 2, and having a smooth surface characterized in that the surface of the hardened layer 4 is polished. Needle felt for paper making. 2. After polymerizing the web on the surface or both sides of the base fabric, needling is performed to form a felt layer on at least the paper-making side of the base fabric, and then the felt layer is coated with or impregnated with a synthetic resin liquid, and then the synthetic resin is applied. A method for producing a needle felt for paper making having a smooth surface, which comprises drying and hardening the liquid and then polishing the surface of the felt layer.